Orthogonal Luciferase-Luciferin Pairs for Bioluminescence Imaging

Area of Science:

• Biochemistry
• Molecular Biology
• Biomedical Imaging

Background:

• Bioluminescence imaging using luciferase-luciferin systems is a key tool in biomedical research for tracking cells.
• Current systems often use the same substrate, limiting the ability to distinguish multiple cell types simultaneously within a single subject.
• There is a need for orthogonal probes to enable multicolor imaging and detailed cell network analysis.

Purpose of the Study:

• To engineer novel, distinguishable luciferase-luciferin pairs for advanced bioluminescence imaging.
• To overcome the limitations of existing probes that cannot differentiate multiple cell types in vivo.
• To develop a general screening platform for identifying new enzyme-substrate pairs.

Main Methods:

• Iterative screening of mutant enzyme libraries against sterically modified luciferins.
• Identification of orthogonal enzyme-substrate pairs with selective interactions.
• In vitro and cell-based validation of the developed bioluminescence probes.

Main Results:

• Successfully crafted custom luciferins selectively processed by engineered luciferases.
• Identified orthogonal enzyme-substrate pairs that produced light upon complementary interaction.
• Demonstrated the functionality of these designer pairs in vitro and in cultured cell models.

Conclusions:

• The developed designer luciferase-luciferin pairs provide distinguishable probes for multicomponent imaging.
• These tools enable the direct interrogation of cell networks, expanding current in vivo imaging capabilities.
• The general screening platform accelerates the discovery of new bioluminescence tools, enhancing the field.